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BQ24640RVARTI Pb-freeN/a1623avaiHigh Efficiency Synchronous Switch-Mode Battery Charge Controller for Super Capacitor 16-VQFN -40 to 85


BQ24640RVAR ,High Efficiency Synchronous Switch-Mode Battery Charge Controller for Super Capacitor 16-VQFN -40 to 85 SLUSA44A–MARCH 2010–REVISED JULY 20155 Pin Configuration and FunctionsRVA Package16-Pin VQFN With ..
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BQ24640RVAR
High Efficiency Synchronous Switch-Mode Battery Charge Controller for Super Capacitor
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bq24640

SLUSA44A –MARCH 2010–REVISED JULY 2015
bq24640 High-Efficiency Synchronous Switched-Mode Super Capacitor Charger Features 2 Applications
Charge Super Capacitor Pack From 2.1Vto26V • Memory Backup Systems CC/CV Charge Profile From0V Without • Industrial UPS Systems and Power Transient
Precharge Buffering 600-kHz NMOS-NMOS Synchronous Buck • Bridge Powerto Buffer the Battery
Controller Description• Over 90% Efficiency forupto 10-A Charge
The bq24640 deviceisa highly integrated switched-Current
mode super capacitor charge controller. The device• 5-Vto 28-V VCC Input Voltage Range offers a constant-frequency synchronous PWM• Accuracy controller with high accuracy charge current, voltage ±0.5% Charge Voltage Regulation regulation, and charge status monitoring. ±3% Charge Current Regulation The bq24640 chargesa super capacitor in two
phases: constant current and constant voltage• High Integration
(CC/CV). The device can charge super capacitors– Internal Loop Compensation from0V with current set on the ISET pin. When the– Internal Digital Soft Start super capacitor voltage reaches the programmed Safety target voltage, charge current begins tapering down. Input Overvoltage Protection The bq24640 entersa low-current sleep mode
(<15 μA) when the input voltage falls below the– Capacitor Temperature Sensing Hot and Cold
output capacitor voltage.Charge Suspend Thermal Shutdown The bq24640 has an input
disable charge, and the STAT• Status Outputs report charge and adapter status.– Adapter Present bq24640 monitors the temperature– Charger Operation Status and suspends charge during hot Charge Enable Pin
Device Information
• 30-ns Driver Dead Time and 99.5% MaximumEffective Duty Cycle• Automatic Sleep Modefor Low PowerConsumption– <15-µA Off-State Super Capacitor Discharge
Current <1.5-mA Off-State Input Quiescent Current
Simplified Schematic
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